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In the title lanthanide(III) compound, [Tb(NO 3 ) 2 (C 2 H 6 N 2 O) 3 ]NO 3 , the asymmetric unit contains one Tb 3+  ion, three acetohydrazide (C 2 H 6 N 2 O) ligands, two coordinated nitrate anions, and an isolated nitrate anion. The Tb 3+  ion is in a ninefold coordinated distorted tricapped trigonal–prismatic geometry formed by three oxygen atoms and three nitrogen atoms from three different acetohydrazide ligands and three oxygen atoms from two nitrate anions. In the crystal, the complex molecules and the non-coordinated nitrate anions are assembled into a three-dimensional supramolecular architecture through extensive N—H...O hydrogen-bonding interactions between the amine NH groups of the acetohydrazide ligands and the nitrate oxygen atoms. Hirshfeld surface analysis was performed to aid in the visualization of intermolecular contacts.

acta crystallographica. section e, crystallographic communications

Crystal structure and Hirshfeld surface analysis of tris(acetohydrazide-κ2 N,O)(nitrato-κO)(nitrato-κ2 O,O′)terbium(III) nitrate